Problem 45252. Restricted Addition v1

Created by Jonathan

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{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Add two numbers without use of common arithmetic operations. Unfortunately, in order to enforce this restriction, other restrictions are imposed. For example, use of 'e' is restricted to prevent use of 'eval' functions.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Until the Cody test system is changed, the hack below will work (as it currently does on every Cody problem). However, this type of solution is not appreciated.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[function ans = fileread(~), '']]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Other hacks are appreciated. If you can circumvent the restrictions (with your code running when called by tests 2, 3, ...) to use addition, then you have a valid and welcomed solution.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>This version of the problem does not require hacks at all, just some basic MATLAB creativity!</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>For a harder version, try</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"https://www.mathworks.com/matlabcentral/cody/problems/45258-restricted-addition-v2\"><w:r><w:t>Restricted Addition v2</w:t></w:r></w:hyperlink><w:r><w:t>.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>See also:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:hyperlink w:docLocation=\"https://www.mathworks.com/matlabcentral/cody/problems/45252-restricted-addition-v1\"><w:r><w:t>Restricted Addition v1</w:t></w:r></w:hyperlink><w:r><w:t>,</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"https://www.mathworks.com/matlabcentral/cody/problems/45258-restricted-addition-v2\"><w:r><w:t>Restricted Addition v2</w:t></w:r></w:hyperlink><w:r><w:t>,</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"https://www.mathworks.com/matlabcentral/cody/problems/45264-restricted-addition-v3\"><w:r><w:t>Restricted Addition v3</w:t></w:r></w:hyperlink><w:r><w:t>,</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"https://www.mathworks.com/matlabcentral/cody/problems/45265-restricted-addition-v4\"><w:r><w:t>Restricted Addition v4</w:t></w:r></w:hyperlink></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:hyperlink w:docLocation=\"https://www.mathworks.com/matlabcentral/cody/problems/45266-restricted-subtraction-v1\"><w:r><w:t>Restricted Subtraction v1</w:t></w:r></w:hyperlink></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:hyperlink w:docLocation=\"https://www.mathworks.com/matlabcentral/cody/problems/45268-restricted-multiplication-v1\"><w:r><w:t>Restricted Multiplication v1</w:t></w:r></w:hyperlink></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Add two numbers without use of common arithmetic operations. Unfortunately, in order to enforce this restriction, other restrictions are imposed. For example, use of 'e' is restricted to prevent use of 'eval' functions.Until the Cody test system is changed, the hack below will work (as it currently does on every Cody problem). However, this type of solution is not appreciated.<pre class="language-matlab">function ans = fileread(~), ''
</pre>Other hacks are appreciated. If you can circumvent the restrictions (with your code running when called by tests 2, 3, ...) to use addition, then you have a valid and welcomed solution.This version of the problem does not require hacks at all, just some basic MATLAB creativity!For a harder version, try <a href = "https://www.mathworks.com/matlabcentral/cody/problems/45258-restricted-addition-v2">Restricted Addition v2</a>.See also:<a href = "https://www.mathworks.com/matlabcentral/cody/problems/45252-restricted-addition-v1">Restricted Addition v1</a>, <a href = "https://www.mathworks.com/matlabcentral/cody/problems/45258-restricted-addition-v2">Restricted Addition v2</a>, <a href = "https://www.mathworks.com/matlabcentral/cody/problems/45264-restricted-addition-v3">Restricted Addition v3</a>, <a href = "https://www.mathworks.com/matlabcentral/cody/problems/45265-restricted-addition-v4">Restricted Addition v4</a><a href = "https://www.mathworks.com/matlabcentral/cody/problems/45266-restricted-subtraction-v1">Restricted Subtraction v1</a><a href = "https://www.mathworks.com/matlabcentral/cody/problems/45268-restricted-multiplication-v1">Restricted Multiplication v1</a>

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Last Solution submitted on Jan 18, 2021

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Rafael S.T. Vieira on 13 Aug 2020

Restricting the usage of 'e' also means prohibiting the keyword 'end' in our code. Maybe you should change it to 'ev'.

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Solution 2152377

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Jonathan on 18 Mar 2020

I like this solution. It is the first I've seen that tries "route 2" (other hacks are appreciated) and succeeds. Good work!

Solution 2088294

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1 Comment

Jonathan on 10 Jan 2020

Nice use of MATLAB functionality.

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Problem 45252. Restricted Addition v1

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